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> Well, here in the UK the norm (for non-commercial mail) is not to include a return address on the outside of the envelope.

Huh? I was always taught to put your address on the back.

Yes, I always put my address on the back of parcels (who sends letters?).

I also always use the short form: house number and post code.

Is this a good method? No idea. Decades of sending parcels. None failed to arrive, so no attempts to return to sender.